.lbt {
    position: relative;
    margin: 0 auto;
    margin-top: 40px;
    margin-bottom: 40px;
    width: 1200px;
    height: 320px;
    border-radius: 10px;
    overflow: hidden;
}
.lbt_left , .lbt_right {
    display: none;
    position: absolute;
    width: 25px;
    height: 35px;
    background: rgba(0, 0, 0, 0.3);
    line-height: 30px;
    text-align: center;
    font-size: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}
.lbt a {
    text-decoration: none;
    color: #fff;
}
.lbt_img li {
    list-style: none;
}
.lbt_img img{
    width: 1200px;
    height: 320px;
    overflow: hidden;
}
.lbt a:hover {
    color: red;
}
.lbt_left {
    left: 0;
}
.lbt_right {
    right: 0;
}
.circle {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
}
.circle li {
    float: left;
    width: 10px;
    height: 10px;
    margin: 0 5px;
    border: 2px solid rgba(255, 255, 255, .5);
    border-radius: 50%;
    /*鼠标经过显示小手*/
    cursor: pointer;
    box-shadow: 1px 1px;
}
.current {
    background-color: #fff;
}
.lbt_img{
    position: absolute;
    display: flex;
}